8 results about "Chromium nitrate" patented technology

The invention discloses a supported catalyst and application thereof in synthesis of difluoroacetyl fluoride, the supported catalyst comprises a carrier and active components, the active components comprise superacid and an active auxiliary agent; in the supported catalyst, the loading capacity of the superacid is 20 wt%-25 wt%, and the loading capacity of the active auxiliary agent is 5 wt%-10 wt%; the superacid is selected from at least one of fluoboric acid, fluorosulfonic acid, fluoroantimonic acid and carborane acid; the active auxiliary agent is selected from at least one of molybdenum nitrate, technetium nitrate, ruthenium nitrate, rhodium nitrate and chromic nitrate; when the supported catalyst is used for synthesizing difluoroacetyl fluoride, 1, 1, 2, 2-tetrafluoroethyl ethyl ether is used as a raw material, hydrogen fluoride is added under the action of the supported catalyst to inhibit generation of ethylene, and difluoroacetyl fluoride and fluoroethane are generated through cracking under relatively mild conditions; compared with an existing preparation method, the conditions are milder, and the one-way yield is larger than 95%.

The invention discloses a recovery method of a catalyst containing platinum, silver, chromium, vanadium, molybdenum and aluminum, which comprises the following steps: uniformly mixing a waste catalyst, caustic alkali and iron powder, reacting at high temperature, cooling to obtain a melt, dissolving the melt, and filtering to obtain a first filter residue and a first filtrate; dissolving the first filter residue with nitric acid, and filtering to obtain platinum-containing waste filter residue and second filtrate; adding a sodium chloride solution into the second filtrate, and filtering to obtain silver chloride filter residues and third filtrate which contains chromic nitrate; adding a barium chloride solution into the third filtrate, reacting at room temperature, and filtering to obtain barium chromate solid filter residues and fourth filtrate; adjusting the pH value of the first filtrate to 7-8 by using an acid, reacting at room temperature, and filtering to obtain activated aluminum oxide filter residues and a fifth filtrate; adding ammonium chloride into the fifth filtrate, reacting at room temperature, and filtering to obtain ammonium vanadate filter residues and sixth filtrate; and adjusting the pH value of the sixth filtrate to be less than 1 by using sulfuric acid, reacting at room temperature, and filtering to obtain molybdic acid filter residues and a seventh filtrate.

The invention belongs to the technical field of photocatalysis, waste recycling and green chemistry, and particularly relates to a CdS-TiO2-Ag ternary composite photocatalyst and a method for preparing ethyl acetate from polylactic acid driven by visible light of the CdS-TiO2-Ag ternary composite photocatalyst. The preparation method comprises the following steps: dissolving chromic nitrate and thiourea in ethylenediamine, carrying out a hydrothermal reaction to prepare CdS nanorods, dispersing the CdS nanorods in deionized water, adding silver nitrate and TiO2 nanoparticles, and finally adding sodium borohydride, and carrying out in-situ reduction deposition to prepare the CdS-TiO2-Ag ternary composite photocatalyst with a heterojunction structure and an efficient charge separation interface. According to the present invention, the method has characteristics of simple process, easy operation, and combination of the high quality reaction conditions, provides significant advantages and beneficial effects in the preparation of ethyl acetate through the solid PLA light reforming, realizes the green and environmentally-friendly waste recycling, and the catalyst maintains the high stability and the reusability in the multiple cycle experiments, and has good industrial application potential.

The application belongs to the technical field of medical material preparation, and particularly relates to a composite material based on photodynamic therapy of periodontitis and a preparation method and application thereof. The method disperses sodium dodecyl benzene sulfonate, tin chloride pentahydrate and L-cysteine in a mixed solution of water and ethylene glycol, uniformly stirs, and obtains nanosheets through hydrothermal reaction; then the nanosheets are mixed with mercapto-polyethylene glycol through ultrasonic, to obtain tin disulfide nanosheets; a germanium oxide solution, a chromium nitrate nonahydrate solution, zinc nitrate hexahydrate, hydrated gallium nitrate and water are mixed, stirred in the dark, ammonia water is added and uniformly stirred, and then hydrothermal reaction is carried out, to obtain long-light-emitting nanoparticles; finally, the tin disulfide nanosheets and the long-light-emitting nanoparticles are dissolved in water, stirred in the dark, a methylene blue solution is added and continuously stirred in the dark, and the composite material based on photodynamic therapy of periodontitis is obtained. The composite material based on photodynamic therapy of periodontitis prepared by the method can effectively improve the curative effect of photodynamic therapy in the treatment of periodontitis.

This invention discloses a trivalent chromium-doped yttrium aluminum garnet powder and its preparation method. The chemical formula of the powder is (Y 1‑ y Ca y )3(Al 1‑x‑z Cr x Mg z )5O 12 Furthermore, 0.001≤x≤0.02, 0.0001≤y≤0.005, and 0.0001≤z≤0.003; This invention uses yttrium nitrate and aluminum nitrate as main materials, and chromium nitrate, magnesium acetate, and calcium acetate as dopants. The precursor is prepared by adding it dropwise to ammonium bicarbonate bottom solution via reverse co-precipitation. The target powder is obtained by drying and calcination. This invention constructs a nitrate-acetate composite system and utilizes the in-situ thermal decomposition gas generation effect of acetate to suppress grain necking, reconstructing hard agglomerates into soft agglomerates. At the same time, it achieves atomic-level in-situ doping of Mg and Ca in the YAG lattice. The resulting powder has both high dispersibility and high sintering activity, and is suitable for preparing Cr:YAG transparent ceramics with high linear transmittance.

The invention relates to a preparation method and application of a guanidyl ionic liquid modified metal organic framework material, and belongs to the technical field of metal organic frameworks. The method specifically comprises the following steps: reacting chromic nitrate nonahydrate, 2-aminoterephthalic acid and a sodium hydroxide aqueous solution according to a certain molar ratio to obtain a metal organic framework, and connecting guanidyl-containing ionic liquid to the metal organic framework through chemical bonds to construct the ILs-MOFs crystal material with a large specific surface area. The material has the advantages of high specific surface area, multiple active sites, high stability, low synthesis cost and the like, and the heterogeneous catalyst is easy to recover. The guanidyl ionic liquid modified metal organic framework material prepared by the invention can efficiently adsorb and activate CO2, and can be used as a catalyst in the process of converting CO2 into high-added-value chemicals.

The invention belongs to the technical field of medical material preparation, and particularly relates to a photodynamic-based composite material for treating periodontitis and a preparation method and application of the photodynamic-based composite material. The method comprises the following steps: dispersing sodium dodecyl benzene sulfonate, tin chloride pentahydrate and L-cysteine into a mixed solution of water and ethylene glycol, uniformly stirring, and carrying out hydrothermal reaction to obtain nanosheets; then mixing with sulfydryl-polyethylene glycol, and carrying out ultrasonic treatment to obtain tin disulfide nanosheets; the preparation method comprises the following steps: mixing a germanium oxide solution, a chromium nitrate nonahydrate solution, zinc nitrate hexahydrate, gallium nitrate hydrate and water, stirring in a dark place, adding ammonia water, continuously stirring uniformly, and carrying out a hydrothermal reaction to obtain long-luminescent nanoparticles; and finally, dissolving the tin disulfide nanosheets and the long luminous nanoparticles in water, stirring in a dark place, adding a methylene blue solution, and continuously stirring in a dark place, thereby obtaining the long luminous nano-particles. The composite material for treating periodontitis based on photodynamic therapy prepared by the invention can effectively improve the curative effect of the photodynamic therapy in periodontitis treatment.

This invention discloses an adsorbent based on MOF materials and its processing technology, belonging to the field of adsorbent technology. The process includes the following steps: adding zirconium-based MOF-Fe3O4 to DMF, ultrasonically mixing, adding terephthalaldehyde, mixing, adding acetic acid, reacting at room temperature for 48-72 h, magnetically separating the precipitate, washing, and vacuum drying to obtain aldehyde-based zirconium-based MOF-Fe3O4; placing chromium nitrate nonahydrate and terephthalic acid in DMF, stirring and mixing, adding modified SBA-15, reacting at 180-220℃ for 12-24 h, cooling and filtering, washing and drying to obtain chromium-based MOF-SBA-15; adding aldehyde-based zirconium-based MOF-Fe3O4 and chromium-based MOF-SBA-15 to ethanol, adding acetic acid, reacting at room temperature, magnetically separating, washing and drying to obtain the MOF-based adsorbent. The MOF-based adsorbent prepared by this invention can be applied to the concentration and treatment of typical industrial VOCs waste gas.